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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff344e056b77c38ecf8ea926ea78d35ec209e1f90f2c587bdb45d081816ae41' 
  AND token = 'gT10H6SLpuNDLI1D2r4AQC66F4/e58eXO7jpoMH0YWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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