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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef695e3d2b4e4c6cc7cde45fc2ee9b2791d4672d20b96cf872889a0a85a24c01' 
  AND token = 'f4b/FHM2itTF07RQIiL13M75bT1OpSLa7NG1ZdCONpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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