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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af3f29fbb076d2213ef2115dab142a82654fa3830ff9925bb557b81eba611cd' 
  AND token = '0ymmUQekEWLnedtWpKT619tH5NNKfT0RoR0a/Q1W9wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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