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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91aa69602bc1cea01efbe621951ef9d2141a1e34324f7d91107c5b241f06b1a1' 
  AND token = '/57OrWk2058CbFUR3vrlso4SPxssKg2I+OsPdDg4cPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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