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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40d93a334a260f72da688a0cd71e302ddd62140fcea6ee524499c8f9a64a29f' 
  AND token = '0GWzcKs/lF/UeKpfxX40h98QPRVIqQ0Gmql0wXW/9mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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