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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45444e57e33de6edb99282375d8ab00e18de97467b9b458cb634970e9291cd02' 
  AND token = 'otzoHkBt6s2rBhwc5Dw/3UjX74m0b/6AX4n14vryrDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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