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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d22bb4a28e3f3a9747af5fe8b36ff061ba415b0d0c45cbf337a12bedb3c3bd8' 
  AND token = '9I28ywfyJSnTglnN2lQ9hEwOZF6e39cdmzEZEO6JCmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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