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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa18c0b01dacbc5c57fe952c06480aa37db01bcf5dfe13a5c6f55a66cc0e901' 
  AND token = '+Ibu7i5N2HVb/C3O/OHmfn9/ceSuz370bLYRWRFALjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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