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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc10c4ac793ebcbe9939eb462507fbcbecb49a0c950a1954468e298c494ee5a' 
  AND token = 'T4pzT+krwPRCC4B3Uin2e2j5pOM4LRHFDWn7+oivwgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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