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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe5b8e20d8ad44ae913a645e2d1d5f11fcb189aedc26a2be4c0e3777fa309ef' 
  AND token = 'xVC+OJwfxE0P59683J5cbk4v0y9MiIQSapr9AkZjTXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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