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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea77e9823de3284d21d0a07a73c3b4e940dc883ea5262d05078b639216f92e35' 
  AND token = 'YWyS7BHC0MCAevPlWtwQ4wjzX4Xwy1k0vqlOVRUpI/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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