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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9521bfec548df9e9b7cde3a1fa2b2edc4107e47936e791f2e2a49abc04b004' 
  AND token = 'gH3vPBHKkH9KLWOZP3YZNCJdkCTsiTzkIj4zcBj/7pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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