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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531c5bafc389c2e9db5449681c64ca9be5ada84a62b25e5996ee6a4f7d437a0d' 
  AND token = 'uqc/iwnZYFqryn/h7n0HKwVVg9Ximist2F6qwn7fEkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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