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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14d9d0ff40f9f586bc360ca8d193d2dd90b6560f0aec7151184c6b3a6cdb9f5' 
  AND token = 'jrHrMXZGGS0r79RBUrsSuonxsrkohkr+xv67/TtM65M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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