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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df1545b78273efa50c68f8db07416a2d7247fed853f83f8c086910da7dd9c6d' 
  AND token = 'YPhoBsXt3cOBdE5oVhxh5kSgUbOcUm8LY3iiI2+wOAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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