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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c702a2894faebca9444ae8b727611fbea784337a0b3179e89462f86c2857716' 
  AND token = 'p0ytZ6hs7fjHdrgCJRQl5AtCQT7WoYG3N38mlYrPuuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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