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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed1f188be5eb83cb9b17e43eaf23cb240f80d19c2d30db9a05c23e30f203612' 
  AND token = 'piaSAppEl5e447CLZ6hEktX9JmwArdAKRvnJ0QFPVx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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