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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d05fff14a820905ce0db4c239b14700e880640ee2f4aa238e77fec0e9efd9d' 
  AND token = '7rPZdy1+ifb0QNpb58CuPSPGst8f3c3NrhmQOwpStYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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