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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6c797b771fc489f7dd66acf065f0ecc4c8c3cae97da7396028811979f07af0' 
  AND token = '5DJDqANDkltyg3kt6krI36yN1NCqhI7sJzRzP4Ub6EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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