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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5da4978cd4d85311a44078912ea5c3a1314a1e5243a20e3b323a575502ca05' 
  AND token = 'aKK8eh670o3qFeKIC/WX1+lggtf0hfLdnPqhD1FcloQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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