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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62a55bdd903e1c1fcb1c63b0d9571d74bd68ae244c74c45a652fe654f6de2a0' 
  AND token = 'OXa3OImPd7k+EPL6PnxCnDzu71XTJirUCprwd4T8AUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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