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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90c4c5e9a3df93b2222691b1bbc9db0c6752b758c315d64ef7ec756a4957ac4' 
  AND token = 'PmLf+K5eoM5fBw6A81hCy5d7nybtRGdIm/CLq3v7hCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}