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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635967e481b4fea30ed5d5f85d7c893f34c0a931fedac6f9abc5bc4effeb3cc6' 
  AND token = 'gNE4lVPAGS6NLgoOcfkM/nC78N2JwyHvmjukJ20njoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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