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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6195f6250b9546fdfd7222e12915ce620c732fecf7ff99f264d3963d1e5922' 
  AND token = 'mYn34PsXA20gH95nDVszvtCZ4lCjDihjFDyxxYmQLjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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