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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056f2148727fed375da2aa948dd7137241a65bbb9368d1c0ff344081d76bbecc' 
  AND token = 'Zbo1WqcYT8pd5w9zUeSOmw7Ok3VASoPp9sakxN2Kf/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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