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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca66055b25127122784753b7e106a0e696e12215c27686bb55f6061cd7b7c73' 
  AND token = 'IId3DSdaqKFu+WQupZJ4o6Bv0dl+W6+4YbhZqm0wlok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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