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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392a6e73ca94342dbc259bf6f170f4dc7421e3a7929d5b0b68ed4f5d757ac708' 
  AND token = '1rif5pFUPX3NviOFI3D0yuZ8QYpVv2kwQrjj63PoF1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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