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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007357fbff887957a484abe5be91498987042bba23ef0f9eb2ff69f195c3186b' 
  AND token = '0N+vGt8E0JyfiondjJb94Y86oTnWbEd4SMao2dFkOdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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