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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719c7ed1aae1f2cbf570373f84100f46e0a49a0306f743928e87d67d2fc6a8f5' 
  AND token = 'xKHkdG7hrZtnzOwE/o8VFPNAIx05/ruQ+XtWnE510go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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