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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82973bc12def4b62c0b2020928f56dbd73c58dd90e1d73b5f5795fe9dd35860c' 
  AND token = 'DMNH7EJ4+ATbjh4Ag/hh1i81kCJMHVnbLYNpV8kF/0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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