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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f78ef999640d025eba071144e493be4c277af72d8759d44739884a259cd6816e' 
  AND token = 'OacexOlaOwHZa7nWtM0bppMhMwpyWnqfq3Nwsim6uqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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