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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7587c5fd3dbe6577d53f11f0658d79d3e4c5056a515adbd55736aea322cbb79d' 
  AND token = 'ptTZcFAfsYodt9z/iKXKobONccMZmh7Z3lxUUuOp19A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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