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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa7e2148b3c9692202b212cf0339551e7ceaa6c9e1bcec2baf9cea4d01f8a31' 
  AND token = 'kditX8jLaccEoZ5z74QWVRwSUsa6CglxNKyHD0BhCYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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