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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4ee460cdccb0b4e533c6694342b9481a1b60a2a243aefd4dc10dd77d06425f' 
  AND token = '63qbrUU44sKV9wZ167Xkw08dxHSX7PVKGxRapjGyzMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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