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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67ffe3c234b186640c7447e36ec04593e5424519f7c3ee0b924fc249930f215' 
  AND token = 'GmWq8kZzTkSP5FTkcFVtPETl59ws6xrIzkMarsoEVds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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