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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1641b2abba03893b05650ef9704e42bbda9d4e698e4dc352c2bf8e051b36859a' 
  AND token = '7elW/ul211uTi3oYwC0xchn5+j/gF2m9nKK3tX/t/PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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