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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a03c9b7f93aeaf12a1c451e8ca034d3e484abb49bd0be29abaf4c27904a4ee2' 
  AND token = 'lzR4b90tQGXZlsA5WVSWnefItOHnEBFZXMj8bMk3n9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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