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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ff1fce7e2c4413802e93314611adf7efd9b80e35dea2bfeb9fc05c104edb38' 
  AND token = 'tMVT3HB6fp75lDoeVhlYov81Apjt4kabY5CuJ6E7I6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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