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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5faf6d95f313016a46ebdc1da9e3b6ce42065495961a6a137391cba006c86b83' 
  AND token = 'RwAh4VCOfZGqhX/MZis6H2NYoaD6pWVLI1x7x94lAyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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