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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e259ad124c25e633ff0bf2bdd0b1cf028e2ffe30213942df2168cee824909ff6' 
  AND token = '2ETQuuj5FzUW3yK6zwDvzpmf/kJ7kKn2PtYl1fmNvko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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