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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7dc89f894574442b3280664d2514cef98ca472180e3ae0d91cd1442fb414ca' 
  AND token = '2LOpQNGaqaujMBvwETS/t8fs9ZOIcaO1cvjYWIZ28Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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