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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b75113c4e5f0f0444e3e5ca1c4f70c2bcbd511d3a1d4c8afe4d32417762a1ed5' 
  AND token = 'fS25X/xIjQFUeMbDhUOZMV8GvTKzoAs2Ia8IBV9z9iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01369

JSON explain

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