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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e646853290e386c5ff5ff1371e00c142496033e31f47d5364a4e84c901026f' 
  AND token = 'xi1Rr6iLGeLuoXfvoXZg/RWxQ5lXzipMaBk/4yd9Qko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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