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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca029034fa67f9e9ef6e15e13580eea0cbe4fcdaee2d01efbc76d00683f4f0e7' 
  AND token = 'e/TFQvZs0n7xxUQGpkBCJuGgnaHGQXQZlircv07t3p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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