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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bd5ae9f778f4a03e55622f6094f485ec7ff0e516f09065d960b3a421830720' 
  AND token = 'atVu4Dmv/wjavh/Z5NoOEPK01EXjaqwN/NadieXeYQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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