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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31362a75f69115e84f4865f74095a4524e6b9f0d841b909a40fa939029eae53' 
  AND token = 'DocBsInpaOWa1whcd+kTV8hHmnbak8AoWruXqmmgWsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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