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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec95f4dbc1df61323cc6518ca4c4d89a465b0e540185e5d2e867defd4b27d7a' 
  AND token = 'ozI0IpKfCO844Vo/FJ4fGQXJhfgrzkO/q6CorGUflKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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