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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18266504ad8a211db40840272b6f4b89bcd0ccc14f10819b1c34db1166b8f2ba' 
  AND token = '0lLZ/ZXatP7IkjzcyQevFE/FRPRIietfj7wVzDa6AO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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