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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f35a91434cc9ab42c5fc37e2106d0b448417c24873265a1ee171cd60001352' 
  AND token = 'sQ46EulA3BeISTBwMCd09TrXj0QoDntoiMvPth+SmBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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