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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e77dd6474bfe4bbfd7169a4b6886c06f5c6b888588afd8bb1e76194660c51f0' 
  AND token = 'u/23glBCZpTJE9ntMIpS4IOlDmnygbzVUhBZbLY1AlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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