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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4cae8c9ca0afb233d4d3b13e8dcc0369fd6d66eacbf7cedfbe9e6ff803a4bb' 
  AND token = '0jttKPxGDVARMSr1+v7IgEEhfX/lFWaC1n9jVLegHbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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