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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79f8369d1133c094b6375889ec6ee8977f565fb5519aebfb12b087106a438b6' 
  AND token = 'ZR3xCkjwuT8wcDcHl1mOJTa0vxMouT2bwLb32aVHXdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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