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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b007ecefe5efaacad448336f20e143226d754f224b0b16b3f9f1ecda7b28601f' 
  AND token = 'oKn8MO7ES8cfj6HNkaVr7KCHsNwBIEngiaq09yIaTJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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