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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b173a7345ef4d26192f5e414b59e438dc002c3df4e5d0e80c693244f4725465b' 
  AND token = 'drhVTHtICHiGJzMviZ0kNf9abs0+3OI/vUQ22dYdYGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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