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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b704f54eddfd5bcf788cd05ea5585d123f1d9bca9fbb77b7984aab1dd6761c97' 
  AND token = '+rHVcDLORgqLjpdM1yYQ47QmdZXPM8dHjdKGfRr8JnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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