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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bece24037136b0c8d87dda666c1f730ea5aef258f3fbb5e111e676c38a9d87' 
  AND token = 'LrR06LXpzB7HtU3aLSF4OjuBhHb53LOqdgeA74GY9YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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