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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b752ed1c6bede5054f15379bd268590872f5f6e5a9e03d1ad723df84b3426c' 
  AND token = 'Hp0kOyVa0p4ecLGQIS2wf82HEc2e4ENZc7Um3epCsHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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