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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0335d1caf72112b2e5f66857cad387625a96f0d40dd38e9787cea8f5fcca89d' 
  AND token = 'eLNTYlDvaLmO1ruK7xgjld7LdKVr7zLeM4ICHtdHb/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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