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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcc06e38ae78016e35feb156d0cf4016d3fd14822555c9512f92a9fd2391203' 
  AND token = '69lgF6w0tygE7/LuAG4vw38kWLhiLJ5ixmnmL/OcQJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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